Power-hammer.



. Np. 703,737. Patented Jul 1, I902.

J. B. McLANE.

POWER HAMMER.

(Application filed Oct. 18, 1901. Uln Model.) I 2 Sheets8heet I.

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UNITED STATES PATENT GFFICE.

JARED B. McLANE, or NORTH'REA'DlNG, MAssAcnUsn rTs.

POWER-HAMM ER.

SPECIFICATION forming part of Letters Patent No. 703,737, dated July 1,1902.

Application filed October 18, 1901. Serial No. 79,079- (No model.)

North Reading, in the county of Middlesex and State of Massachusetts,have invented certain new and useful Improvements in Power- Hammers, ofwhich the following is a speci-.

fication. 1

This invention relates to power-hammers; and it consistsin certainimprovements therein hereinafter described and claimed, having for theirobject to condense the spring portion of apparatus employing springs toconnect the hammer or striker with its operating mechanism, to provideguides for the hammer which shall be more secure and inexpensive toapply and renew than prior constrnctions, and to provide a treadlemechanism which may be operated from various positions with respect tothe machine and with equal facility in any of said positions.

Of theaccompanying drawings, Figure 1 represents a front elevation of apower-hammer provided with my improvements. Fig. 2 represents a sideelevation. Fig.3 repre sents an enlarged section on the line 8 3 ofFig. 1. Fig. 4 represents an enlarged vertical section of the spring andconnections. Fig. 5 represents a section on the line 5 5 of Fig. 1,showing the treadle mechanism in plan.

The same reference characters indicate the same parts in all thefigures.

In the drawings, 1 represents the cast frame of the hammer. 2 is theanvil; 3, the hammer, mounted to slidein vertical guides, and 4 is thedriving-shaft, mounted in bearings at the upper end of said frame. Aconstantlyrunning'belt 5, normally loose on a pulley 6, attached to theshaft, is controlled by a belt-tightener 7 on a lever 8, oscillatedbythe treadle mechanism, whereby the beltmay be caused to grip the pulleyand rotate the shaft 4.

Fixed to the front end of the shaft 4 is a fly-wheel 9, having awrist-pin 10, connected by a link 11 with a spring 12, whose lower endsare attached to the outer ends of two ,pairs of links 1313,which'suspend the ham- 15 15 being outwardly and upwardly rec-urvedor looped at 16 16 in their lower portions. The connection with theouter ends of the links 13 13 is formed by pintles 1717, passing throughthe links and surrounded by bushings 18 18, which occupy the bent orhooked extremities 19 1.) of the spring-arms. -This construction enablesme to obtain a long spring and long suspending links, giving greaterelasticity tothe blow, out condenses the spring as a whole bothlongitudinally and horizontally, which, among other things, reduces thedanger of the operatives being struck by the spring.

The guides for the hammer are detachable from the frame land areconstructed as follows: On the frame 1 is formed a flat seat 20, againstwhich the guide is-held by two vertical rows of bolts 21 21. The guidecomprises a gib-holder or base 22, having a planed outer face forming abearing for the back of a dovetailed guide-engaging'portion 23 of thehammer 3, and two gibs 24 24, mountedin said holder and engaging theedges of said dove- The bolts 21 pass through tailed portion. the gibsand holder and serve to secure the twotogether and to the seat 20 on theframe. Adjustment of the gibs in a horizontal direction is effected bymeans of adjustingbolts 25-25, mounted in the holder 22, the

'gibs having elongated slots 26, occupied by thebolts 21, to'permitsu'ch adjustment. The back of the gib-holder 22 and the face of the seat20 are left unplaned, and between the two are interposed two leatherpackingstrips 27 27. Other soft materialsuoh as paper, fiber, lead,&c.may be employed, although leather is preferred. The gibholder findsits own bearing with respect to the seat 20 when the bolts aretightened, for the irregularities of each metal surface sink into thesoft packing and a very secure joint is made. The guidemay be removedbodily from the machine, making the expense of replaning or renewalrelatively small, and

the construction is obviously such that the parts are few in number andmay be easily assembled, taken apart, or adjusted. The interposition ofthe leather packing avoids the expense of planed seating-surfaces forthe removable guide, and the cushioning action of this packing increasesthe life of the guide and prevents the bolts 21 from becoming loosenedby the jarring of the machine.

A further improvement lies in the treadle construction, which I shallnow describe. 28 28 represent; two rocking treadle-frames having sidearms 29 29 and cross portions 30 30 at the outer ends of the side arms.The frames have four hinge-bearings 31 31 at the inner ends of theirside arms, and the side arms of one frame are crossed with those of theother frame and pivotally connected thereto at the crossing by bolts 3232, attached to one set of arms and occupying elongated slots 33 in theother set. One of the side arms is connected by a rod 34 with the lever8, which carries the belt-tightener 7. The belt-tightener may beactuated by stepping on any part of the treadle structure above thebolts 32 32, which willresultin depressing the rod 34 without anynoticeable springing of either of the treadle-frames, such as isobservable in single treadle-frames of the shape shown when the sideaway from the operatingconnection,such as 34,is stepped on.

I claim- 1. In a power-hammer, the combination of a hammer, ahammer-operating member, and a connection between the twoincludingapairof links suspending the hammer at their outer ends, and a lyre-shapedspring device connected with the hammer-operating member and having twodepending spring-arms formed with outwardly and upwardly re- .curvedterminal portions connected to the outer ends of the links.

2. In a power-hammer, the combination of a frame having a seat for aguide, hammeroperating means mounted on said frame, a hammer, a guidetherefor, having an unplaned back, bolts detachably securing the guideto said seat on the frame, and a soft packing interposed between theguide and said seat.

3. In a power-hammer, the combination of a frame having a seat for aguide, hammeroperating means mounted on said frame, a hammer having adovetailed guide-engaging portion, a guide for said hammer comprising agib-holder engaging the back of said dovetailed portion of the hammer,gibs mounted in said holder and engaging the edges of said dovetailedportion, and bolts passing through said gibs and gib-holder anddetachably securing the same together and to said seat on the frame.

In testimony whereof I have afiixed my signature in presence of twowitnesses.

JARED B. MCLANE.

Witnesses:

C. F. BROWN, A. D. HARRIsON.

